Sigma already had a 24-35 f/2 for Canon EF.Canon shocked the world with the 28-70 2.0. I personally never thought there would be lower than a 2.8 on a zoom lens.
SIGMA 24-35mm F2 DG HSM | Art
The world's first F2 constant aperture zoom lens for full-frame DSLR cameras.
www.sigmaphoto.com
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